Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for chromium-free ZrO2-CaO.ZrO2 composite material for coal-water slurry gasification furnace

A composite material and gasifier technology, applied in the field of refractory materials, can solve the problems of poor thermal shock resistance of high-chrome bricks, affecting the use of gasifiers, spalling, etc., and achieve excellent performance indicators, good social and economic benefits, and cost. low effect

Inactive Publication Date: 2018-07-06
江苏诺明高温材料股份有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cr 2 o 3 -Al 2 o 3 -ZrO 2 Brick (nearly 90% Cr 2 o 3 ) has excellent slag erosion resistance, high temperature performance, erosion resistance, thermal shock resistance and thermal spalling resistance. It is currently the main material for the working layer of domestic coal-water slurry pressurized gasifiers, but there are major disadvantages : High raw material cost; Cr 2 o 3 The high volatility makes it difficult to sinter and densify; adding monoclinic ZrO 2 The thermal shock resistance of high chrome bricks has been greatly improved, but the thermal shock resistance of high chrome bricks is still poor at present, and peeling and cracking often occur during use, which greatly affects the gasifier. Use; due to Cr in high chrome bricks 2 o 3 Will be oxidized to toxic CrO under certain conditions 3 ,polluted environment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for chromium-free ZrO2-CaO.ZrO2 composite material for coal-water slurry gasification furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of chromium-free ZrO for coal-water slurry gasifier 2 -CaO·ZrO 2 The preparation method of composite material, (1) by mole percentage, 10% CaO and 90% ZrO 2 , sintered at 1500-1750°C for a certain period of time to prepare CaO·ZrO 2 Composite material; (2) by mass percentage, 60% ZrO 2 , 40% CaO·ZrO 2 Composite materials, plus 3% zirconium sol as a binder, during production, first weigh various raw materials according to the ratio, mix them evenly, and get mud after mixing, and then press them into shape with a friction press, first at 120-250 ° C Dry for 10-25 hours, and then sinter at a high temperature of 1550°C-1800°C for 5-12h.

[0017] The performance index of the obtained product is: apparent porosity 15%, bulk density 3.85g / cm 3 , normal temperature compressive strength 140MPa, thermal shock stability (1100°C, water cooling) 27 times, high temperature flexural strength 20MPa, and good hydration resistance, redox resistance, coal ash slag erosion resi...

Embodiment 2

[0019] A kind of chromium-free ZrO for coal-water slurry gasifier 2 -CaO·ZrO 2 The preparation method of composite material, (1) by mole percentage, 20% CaO and 80% ZrO 2 , sintered at 1500-1750°C for a certain period of time to prepare CaO·ZrO 2 Composite material; (2) by mass percentage, 65% ZrO 2 , 35% CaO·ZrO 2 Composite materials, plus 3% dextrin as a binder, during production, first weigh various raw materials according to the proportion, mix them evenly, and get mud after mixing, and then press them into shape with a friction press, first at 120-250°C Dry for 10-25 hours, and then sinter at a high temperature of 1550°C-1800°C for 5-12h.

[0020] The performance index of the obtained product is: apparent porosity 14.3%, bulk density 3.92g / cm 3 , normal temperature compressive strength 155MPa, thermal shock stability (1100°C, water cooling) 29 times, high temperature flexural strength 33MPa, and good hydration resistance, redox resistance, coal ash slag erosion resis...

Embodiment 3

[0022] A kind of chromium-free ZrO for coal-water slurry gasifier 2 -CaO·ZrO 2 The preparation method of composite material, (1) by mole percentage, 30% CaO and 70% ZrO 2 , sintered at 1500-1750°C for a certain period of time to prepare CaO·ZrO 2 Composite material; (2) by mass percentage, 60% ZrO 2 , 40% CaO·ZrO 2 Composite materials, plus 3% zirconium sol as a binder, during production, first weigh various raw materials according to the ratio, mix them evenly, and get mud after mixing, and then press them into shape with a friction press, first at 120-250 ° C Dry for 10-25 hours, and then sinter at a high temperature of 1550°C-1800°C for 5-12h.

[0023] The performance index of the obtained product is: apparent porosity 13.5%, bulk density 3.97g / cm 3 , normal temperature compressive strength 186MPa, thermal shock stability (1100°C, water cooling) 32 times, high temperature flexural strength 48MPa, and good hydration resistance, redox resistance, coal ash slag erosion re...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Bulk densityaaaaaaaaaa
Normal temperature compressive strengthaaaaaaaaaa
High temperature flexural strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method for chromium-free ZrO2-CaO.ZrO2 composite material for a coal-water slurry gasification furnace, and belongs to the field of refractory materials. The preparation method comprises the following steps: (1) preserving the heat of a CaO source, a ZrO2 source and a bonding agent at 1500-1750 DEG C for a certain time, carrying out sintering to prepare a CaO.ZrO2 composite material with high density and perfect crystal grain development; and (2) crushing the synthesized CaO.ZrO2 composite material into different granular sizes, mixing the synthesized CaO.ZrO2 composite materials with ZrO2 in different granular sizes according to different proportions, adding a proper proportion of a binding agent, adding a proper ratio of a bonding agent, carrying out pressing formation, carrying out drying at 120-250 DEG C for 10-25 hours, and then carrying out high-temperature sintering at 1550-1800 DEG C for 5-12 hours. The product provided by the invention has high compactness, high strength, excellent thermal shock stability, hydration resistance, and coal ash slag erosion resistance and permeability resistance, can meet the use of the coal-water slurrygasification furnace, has high cost performance, does not cause environmental pollution in production and use, can be recycled, and is an environment-friendly material.

Description

technical field [0001] The invention relates to a chromium-free ZrO used in a coal-water slurry gasifier 2 -CaO·ZrO 2 The invention relates to a preparation method of a composite material, which belongs to the field of refractory materials. Background technique [0002] With the dwindling of domestic oil and gas resources, coal gasification technology is more and more used in chemical plants such as coal-to-gas, coal-to-methanol, coal-to-chemical fertilizer, and coal-to-oil. In many coal gasification processes, such as coal-water slurry , Pulverized coal furnace, coal-water slurry gasification process is the most widely used and most successful process technology in China. [0003] The pressurized gasification temperature of coal-water slurry is usually 1300℃~1600℃, which is higher than the ash melting temperature of coal, and the gasification pressure is 2.0MPa-8.5MPa. The furnace is a strong reducing atmosphere, accompanied by solid particles, liquid acid melting The hi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/482C04B35/622C04B35/626C10J3/48
CPCC04B35/482C04B35/622C04B35/62645C04B2235/3208C04B2235/656C04B2235/77C04B2235/96C04B2235/9669C04B2235/9684C10J3/48
Inventor 钱晶张军杰钱志明黄京衡
Owner 江苏诺明高温材料股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com